package idv.loveloser.servlet;

import idv.loveloser.dao.MdlContext;
import idv.loveloser.dao.MdlContextDAO;
import idv.loveloser.dao.MdlCourseDAO;
import idv.loveloser.dao.MdlRoleAssignments;
import idv.loveloser.dao.MdlRoleAssignmentsDAO;
import idv.loveloser.dao.MdlUserDAO;
import idv.loveloser.util.Util;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.google.gson.JsonObject;

public class IsUserAsAStudentInCourse extends HttpServlet {
	private MdlUserDAO userDAO = new MdlUserDAO();
	private MdlContextDAO contextDAO=new MdlContextDAO();
	private MdlCourseDAO courseDAO = new MdlCourseDAO();
	private MdlRoleAssignmentsDAO roleAssignmentDAO = new MdlRoleAssignmentsDAO();
	private static final long CPNTEXT_COURSE=50L;
	/**
	 * Constructor of the object.
	 */
	public IsUserAsAStudentInCourse() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		response.setCharacterEncoding("UTF-8");
		String client = request.getParameter("client");
		String sessionKey = request.getParameter("sessionKey");
		String courseId=request.getParameter("courseId");
		long userId = Util.getUserId(Long.parseLong(client));
		boolean returnBool=false;
		long contextId=-1L;
		if(Util.isAuthorised(client, sessionKey)){
			List<MdlContext> contexts=contextDAO.findByContextlevel(CPNTEXT_COURSE);
			for(int index=0;index<contexts.size();index++){
				MdlContext context =contexts.get(index);
				if(context.getInstanceid()==Long.parseLong(courseId)){
					contextId =context.getId();
					break;
				}
			}
			List<MdlRoleAssignments> roles = roleAssignmentDAO.findByContextid(courseId);
			for(int index=0;index<roles.size();index++){
				MdlRoleAssignments role = roles.get(index);
				if((role.getRoleid()==5L) && (role.getUserid()==userId)){
					returnBool=true;
					break;
				}
			}
			JsonObject json = new JsonObject();
			json.addProperty("isStudent", returnBool);
			out.println(json);
		}
		out.flush();
		out.close();
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		out.println("  <BODY>");
		out.print("    This is ");
		out.print(this.getClass());
		out.println(", using the POST method");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}
